CN106920921B - A kind of mobile base station low temp lithium ion battery cathode pole piece, preparation method and lithium ion battery - Google Patents
A kind of mobile base station low temp lithium ion battery cathode pole piece, preparation method and lithium ion battery Download PDFInfo
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
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- H01M4/02—Electrodes composed of, or comprising, active material
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- H01M4/02—Electrodes composed of, or comprising, active material
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- H—ELECTRICITY
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Abstract
The present invention relates to a kind of mobile base station low temp lithium ion battery cathode pole piece, preparation method and lithium ion batteries.The cathode pole piece includes collector, active material layer, it further include the energy-storage function layer of the side of the separate collector positioned at active material layer, the energy-storage function layer includes functional materials and conductive agent, the mass ratio of functional materials and conductive agent is (1~5): (1~5), and the functional materials are melamine cyanurate, melamine salt of pentaerythritol phosphate, ammonium polyphosphate, dimethyl silicone polymer or melamine pyrophosphate.The lithium ion battery negative electrode, energy-storage function layer is set outside active material layer, when battery temperature is high, heat is can absorb as reaction entropy, there is provided energy for electrochemical reaction, while functional materials can store energy, under cryogenic can release energy, the progress for promoting electrochemical reaction, improves the cryogenic property of negative electrode tab.
Description
Technical field
The invention belongs to field of lithium ion battery, and in particular to a kind of mobile base station low temp lithium ion battery cathode pole
Piece, preparation method and lithium ion battery.
Background technique
Arrival and market startup with China's communication 4G epoch, communication base station are that energy-storage battery brings fast development
Opportunity, battery used in communication base station is mostly lead-acid battery at present, and that there are energy densities is low, cycle life is short, pollution is strong etc.
Defect does not adapt to the demand for development of communication base station battery.Lithium ion battery has specific energy height, light weight, service life long
And the advantages that memory-less effect, it is widely used to the fields such as various consumer electronic devices, energy storage, mobile power source at present, is expected to
Potential solution as mobile base station battery.
The cryogenic property of traditional lithium-ion battery is poor, the low temperature charging and discharging capabilities when northern frore area or field use
Difference, it is difficult to meet the requirement of northern frore area mobile base station.Develop a kind of low form that low temperature charge-discharge performance is excellent
Lithium ion battery has important practical significance so as to be applied to mobile base station field.
The preparation good negative electrode tab of cryogenic property is to improve one of the method for lithium ion battery cryogenic property.It improves at present negative
The main method of pole material at low temperature performance has: 1) graphite surface is modified, i.e. type, quantity by changing graphite surface functional group
And defect, to increase the compatibility and structural stability of graphite and electrolyte；2) increase graphite layers away from filling to improve lithium ion
Embedding rate and the ion diffusion rates out of lithium ion, improve the structural stability in charge and discharge process in discharge process；3) pass through
The cryogenic property that coating modification improves graphite material is carried out to graphite, such as high outstanding person proposes a kind of low-temperature lithium ion battery cathode
The preparation method (Fudan University's Master's thesis, in April, 2007) of material, by different method for coating in Graphite Coating
One layer of metal, agraphitic carbon or oxide, so as to the active site that masking graphite avoids, so that the decomposition of PC is avoided, but it is steady
Qualitative and its poor circulation, conductivity increase rate is little, and preparation process is complicated, it is difficult to guarantee consistency, industrialization promotion
It is more difficult.
The patent that application publication number is CN102237553A discloses a kind of lithium ion battery and preparation method, is to use
Natural graphite and conductive carbon black improve the electric conductivity of cathode pole piece under low temperature by the utilization of conductive carbon black as cathode system,
Insertion speed of the lithium ion in cathode is improved, so as to improve the charge-discharge performance of lithium ion battery at low temperature.The cathode pole
Piece chemical property is 10 DEG C, when ambient temperature drops to 0 DEG C, even -20 DEG C, negative electrode tab in minimum test temperature
How unknown cryogenic property is.
Summary of the invention
It is negative with low temp lithium ion battery that the object of the present invention is to provide a kind of mobile base stations used at 0~-40 DEG C
Pole pole piece, to solve the problems, such as existing negative electrode tab poor performance at low temperatures.
A second object of the present invention is to provide the preparation methods of above-mentioned low temp lithium ion cathode pole piece.
Third object of the present invention is to provide a kind of lithium ion batteries using above-mentioned negative electrode tab.
In order to achieve the goal above, the technical scheme adopted by the invention is that:
A kind of mobile base station low temp lithium ion battery cathode pole piece, including collector, active material layer, further include position
Energy-storage function layer in the side of the separate collector of active material layer, the energy-storage function layer includes functional materials and conduction
The mass ratio of agent, functional materials and conductive agent is (1~5): (1~5), and the functional materials are melamine cyanurate
Salt, melamine salt of pentaerythritol phosphate, ammonium polyphosphate, dimethyl silicone polymer, one in melamine pyrophosphate
Kind.
It can refer to the prior art and prepare active material layer in collection liquid surface, then coat energy storage in active material layer surface
Functional layer slurries, then through drying；Energy-storage function layer slurries by functional materials, conductive agent, binder, solvent mixing and
Mass ratio at, functional materials, conductive agent, binder is (1~5): (1~5): (10~20).The type and bonding of solvent
The type of agent is adapted.
Mobile base station provided by the invention low temp lithium ion battery cathode pole piece, is arranged energy storage outside active material layer
Functional layer, when battery temperature is high, can absorb heat be used as reaction entropy, be electrochemical reaction carry out energy, while function are provided
Energy property substance can store energy, under cryogenic can release energy, promote the progress of electrochemical reaction, Jin Erti
The cryogenic property of high negative electrode tab.In addition, energy-storage function layer is set to the outer layer of pole piece, directly contacted with diaphragm, and the position
It is the maximum position of resistance in battery, heat, storage energy can be utmostly absorbed in cell operations, consequently facilitating
It when lithium ion battery is in cryogenic conditions, releases energy in time, activates the transmission rate of lithium ion, to improve lithium ion battery
Low temperature electrochemical performance.
Preferably, solid electrolyte layer, the solid electrolyte layer packet are additionally provided between active material layer, energy-storage function layer
Include solid electrolyte and conductive agent, the mass ratio of solid electrolyte and conductive agent is (1~5): (1~5).Preferably, solid electricity
Xie Zhiwei Li5La3Ta2O12、Li5La3Nb2O12、Li6BaLa2Ta2O12、Li6MgLa2Ta2O12One of.
After collection liquid surface prepares active material layer, solid electricity is being coated in active material layer surface referring to the prior art
Matter layer slurries are solved, solid electrolyte layer is formed after dry, then coat energy-storage function layer slurries in solid electrolyte layer surface, does
It is dry, corresponding pole piece can be prepared.The solid electrolyte layer slurries by solid electrolyte, conductive agent, binder, solvent mixing and
Mass ratio at, solid electrolyte, conductive agent, binder is (1~5): (1~5): (10~20).The type and bonding of solvent
The type of agent is adapted.
Further, using the structure setting of active material layer, solid electrolyte layer, energy-storage function layer, solid electrolyte
The transmission rate of lithium ion under cryogenic conditions can be improved in lithium-containing compound in layer, improves its low temperature discharge ability；Solid electricity
The occurrence probability of side reaction can also be reduced to avoid active material directly and electrolyte contacts by solving matter layer；Solid electrolyte layer, storage
Energy functional layer can play synergistic effect, under cryogenic, prevent energy from leaking, improve the transmission rate of lithium ion, improve
Low temperature discharge ability.
Preferably, conductive layer is equipped between collector and active material layer.Contain conductive agent, effect master in conductive layer
If improving electron conductivity.It is further preferred that conductive layer is made of three-dimensional carbon material and binder, three-dimensional carbon material and viscous
The mass ratio for tying agent is (60~80): (20~40)；The three-dimensional carbon material is In-situ reaction carbon nanotube, stone on carbon fiber
What black alkene obtained.The three-dimensional carbon material is compound by the carbon system ternary network structure that carbon fiber, graphene and carbon nanotube form
Material；Application publication number can be used to be prepared for patent disclosed in CN103496688A, specifically includes the following steps:
A) by after carbon fiber dip-coating carbon nano-tube catalyst solution, in the presence of carbon-source gas carbon nano-tube in situ/
Carbon fiber binary composite；
B) it by after carbon nanotube/carbon fiber binary composite dip-coating graphene oxide dispersion, through heating treatment, prepares
Graphene/carbon nano-tube/carbon fiber three-dimensional carbon material.
The conductive layer is by being dried to obtain after the coating of conductive layer slurries；Conductive layer slurries are by three-dimensional carbon material, bonding
Agent, solvent mix, and the mass ratio of three-dimensional carbon material and binder is (60~80): (20~40)；The type of solvent and viscous
The type for tying agent is adapted.The corresponding solvent of aqueous binders is water, and non-aqueous resins correspond to corresponding organic solvent, such as viscous
When knot agent is Kynoar, solvent selection N-Methyl pyrrolidone.
Further, it is small to can use three-dimensional carbon materials conductive rate height, particle using above-mentioned three-dimensional carbon material for conductive layer
Characteristic increases the contact area with collector and active material, reduces internal resistance, improves its multiplying power, low temperature discharge ability；Use fibre
The three-dimensional carbon material for tieing up shape carbon nanotubes, flake graphite alkene and fibrous solid carbon fiber In-situ reaction, can play three
The synergistic effect of person further increases the electron conductivity between material.
The active material layer includes graphite and conductive agent, and the mass ratio of graphite and conductive agent is (90~95): (1~5).
Carbon nanotube, graphene, carbon black, gas-phase growth of carbon fibre, one in three-dimensional carbon material may be selected in above-mentioned conductive agent
Kind.
Preferably, above-mentioned mobile base station low temp lithium ion battery cathode pole piece, including collector and in collector two
Conductive layer that lateral edge is set gradually far from collector thickness direction, active material layer, solid electrolyte layer, energy-storage function layer, institute
Stating solid electrolyte layer includes solid electrolyte and conductive agent, and the mass ratio of solid electrolyte and conductive agent is (1~5): (1~
5)。
The preparation method of above-mentioned mobile base station low temp lithium ion battery cathode pole piece, comprising the following steps:
1) conductive agent, binder, solvent are mixed, prepares conductive layer slurries；By solid electrolyte, conductive agent, binder,
Solvent mixing, prepares solid electrolyte layer slurries；Functional materials, conductive agent, binder, solvent are mixed, energy storage function is prepared
Ergosphere slurries；
2) in collection liquid surface conductive coating slurries, conductive layer is formed after dry；Active matter is coated in conductive layer surface
Matter layer slurries form active material layer after dry；Solid electrolyte layer slurries are coated in active material layer surface, are formed after dry
Solid electrolyte layer；Coat energy-storage function layer slurries in solid electrolyte layer surface, formed after dry energy-storage function layer to get.
In step 1), conductive layer slurries are made of solvent and conductive agent, binder；Preferably, conductive agent is three-dimensional carbon materials
The mass ratio of material, conductive agent and binder is (60~80): (20~40)；Solid electrolyte layer slurries are by solvent and solid electrolytic
Matter, conductive agent, binder composition, solid electrolyte, conductive agent, binder mass ratio be (1~5): (1~5): (10~
20)；Energy-storage function layer slurries are made of solvent and functional materials, conductive agent, binder, functional materials, conductive agent, bonding
The mass ratio of agent is (1~5): (1~5): (10~20).The prior art can be used in active material layer slurries, such as using solvent and
Graphite, conductive agent, binder making active material layer slurries, graphite, conductive agent, binder mass ratio be (90~95): (1
~5): (1~5).
The above-mentioned mobile base station preparation method of low temp lithium ion battery cathode pole piece, simple process, cost of material is low,
Gained negative electrode tab cryogenic property is good, can be used for the preparation of low temp lithium ion battery.
It is a kind of to use the above-mentioned mobile base station lithium ion battery of low temp lithium ion battery cathode pole piece.Positive plate can be adopted
With the prior art, positive plate such as is formed in collection liquid surface coating LiFePO4 slurry, using LiPF6/ EC+DEC be (EC, DEC's
Volume ratio 1:1, LiPF6Concentration be 1.3mol/L) be electrolyte, 2400 film of Celgard is diaphragm, prepares lithium ion battery.
Lithium ion battery of the invention reaches 77.5% in -20 DEG C of capacity retention ratios, and -40 DEG C of capacity retention ratio reaches
To 45.7%, low temperature charge-discharge performance is good, can satisfy the requirement of outdoor moving base station.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of mobile base station low temp lithium ion battery cathode pole piece of the invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.In following embodiment three used in conductive layer
Dimension carbon material is prepared referring to the method for the patent Example 1 that application publication number is CN103496688A.
Embodiment 1
The mobile base station of the present embodiment low temp lithium ion battery cathode pole piece, structural schematic diagram is as shown in Figure 1, include
Collector (copper foil) 1 and conductive layer 2, the active material layer set gradually in 1 liang of lateral edge of collector far from collector thickness direction
3, solid electrolyte layer 4, energy-storage function layer 5；Conductive layer is made of three-dimensional carbon material and Kynoar, and three-dimensional carbon material gathers
The mass ratio of vinylidene is 70:30；Active material layer is made of graphite, SP conductive agent and Kynoar, the quality of three
Than for 94:1:5；Solid electrolyte layer is by solid electrolyte Li5La3Ta2O12, carbon nanotube, Kynoar composition, three's
Mass ratio is 3:3:15；Energy-storage function layer is made of melamine cyanurate, carbon nanotube, Kynoar, the matter of three
Amount is than being 3:3:15.
The preparation method of the mobile base station of the present embodiment low temp lithium ion battery cathode pole piece, comprising the following steps:
1) 30g Kynoar is added into the N-Methyl pyrrolidone of 500ml, 70g three-dimensional is added after being uniformly dispersed
Carbon material obtains conductive layer slurries in high speed disperser after high speed dispersion 2h (rate of dispersion is 4000 revs/min)；
94g graphite, 1g SP conductive agent, 5g Kynoar are added into the N-Methyl pyrrolidone of 100ml, dispersion is equal
Active material layer slurries are obtained after even；
15g Kynoar is added into the N-Methyl pyrrolidone of 100ml, 3g carbon nanotube is added after being uniformly dispersed,
High speed dispersion 1h (rate of dispersion is 4000 revs/min), then add the Li of 3g5La3Ta2O12, (rate of dispersion is high speed dispersion 1h
2000 revs/min), obtain solid electrolyte layer slurries；
15g Kynoar is added into the N-Methyl pyrrolidone of 100ml, 3g carbon nanotube is added after being uniformly dispersed,
High speed dispersion 1h (rate of dispersion is 4000 revs/min), then the melamine cyanurate of 3g is added, high speed dispersion 1h (dispersion speed
Degree is 2000 revs/min), obtain energy-storage function layer slurries；
2) conductive layer slurries are coated on by 10 μm of double light copper foil surfaces by intaglio press, it is dry after formation with a thickness of
2 μm of conductive layer；In conductive layer surface by coater active material layer slurry, formed after dry with a thickness of 200 μm
Active material layer；In active material layer surface by coater solid electrolyte layer slurries, formed after dry with a thickness of 8 μm
Solid electrolyte layer；In solid electrolyte layer surface by coater energy-storage function layer slurries, thickness is formed after dry
For 3 μm of energy-storage function layers to get.
The lithium ion battery of the present embodiment, including negative electrode tab, positive plate, diaphragm and electrolyte, negative electrode tab use this implementation
The cathode pole piece of example, positive plate use active material for the conventional cathode piece of LiFePO4, and diaphragm uses 2400 film of Celgard,
Electrolyte is by LiPF6It is formed with mixed solvent, LiPF6Concentration be 1.3mol/L, mixed solvent by volume ratio be 1:1 EC,
DEC is mixed, and is assembled into 5AH soft-package battery using the prior art.
Embodiment 2
The mobile base station of the present embodiment low temp lithium ion battery cathode pole piece, structure are same as Example 1, wherein
Conductive layer is made of three-dimensional carbon material and Kynoar, three-dimensional carbon material, Kynoar mass ratio be 80:20；Activity
Material layer is made of graphite, SP conductive agent and Kynoar, and the mass ratio of three is 94:1:5；Solid electrolyte layer is by solid
Electrolyte Li5La3Nb2O12, graphene, Kynoar composition, the mass ratio of three is 1:1:10；Energy-storage function layer is by season penta
Tetrol phosphate melamine salt, graphene, Kynoar composition, the mass ratio of three are 1:1:10.
The preparation method of the mobile base station of the present embodiment low temp lithium ion battery cathode pole piece, comprising the following steps:
1) 20g Kynoar is added into the N-Methyl pyrrolidone of 500ml, 80g three-dimensional is added after being uniformly dispersed
Carbon material obtains conductive layer slurries in high speed disperser after high speed dispersion 2h (rate of dispersion is 4000 revs/min)；
94g graphite, 1g SP conductive agent, 5g Kynoar are added into the N-Methyl pyrrolidone of 100ml, dispersion is equal
Active material layer slurries are obtained after even；
10g Kynoar is added into the N-Methyl pyrrolidone of 100ml, 1g graphene is added after being uniformly dispersed, it is high
Speed dispersion 1h (rate of dispersion is 4000 revs/min), then add the Li of 1g5La3Nb2O12, high speed dispersion 1h (rate of dispersion 2000
Rev/min), obtain solid electrolyte layer slurries；
10g Kynoar is added into the N-Methyl pyrrolidone of 100ml, 1g graphene is added after being uniformly dispersed, it is high
Speed dispersion 1h (rate of dispersion is 4000 revs/min), then the melamine salt of pentaerythritol phosphate of 1g is added, high speed dispersion 1h
(rate of dispersion is 2000 revs/min), obtains energy-storage function layer slurries；
2) conductive layer slurries are coated on by 10 μm of double light copper foil surfaces by intaglio press, it is dry after formation with a thickness of
1 μm of conductive layer；In conductive layer surface by coater active material layer slurry, formed after dry with a thickness of 100 μm
Active material layer；In active material layer surface by coater solid electrolyte layer slurries, formed after dry with a thickness of 5 μm
Solid electrolyte layer；In solid electrolyte layer surface by coater energy-storage function layer slurries, thickness is formed after dry
For 1 μm of energy-storage function layer to get.
The lithium ion battery of the present embodiment, using the negative electrode tab of the present embodiment, remaining is the same as embodiment 1.
Embodiment 3
The mobile base station of the present embodiment low temp lithium ion battery cathode pole piece, structure are same as Example 1, wherein
Conductive layer is made of three-dimensional carbon material and Kynoar, three-dimensional carbon material, Kynoar mass ratio be 60:40；Activity
Material layer is made of graphite, SP conductive agent and Kynoar, and the mass ratio of three is 94:1:5；Solid electrolyte layer is by solid
Electrolyte Li6BaLa2Ta2O12, gas-phase growth of carbon fibre, Kynoar composition, the mass ratio of three is 5:5:20；Energy storage function
Ergosphere is made of ammonium polyphosphate, gas-phase growth of carbon fibre, Kynoar, and the mass ratio of three is 5:5:20.
The preparation method of the mobile base station of the present embodiment low temp lithium ion battery cathode pole piece, comprising the following steps:
1) 40g Kynoar is added into the N-Methyl pyrrolidone of 500ml, 60g three-dimensional is added after being uniformly dispersed
Carbon material obtains conductive layer slurries in high speed disperser after high speed dispersion 2h (rate of dispersion is 4000 revs/min)；
94g graphite, 1g SP conductive agent, 5g Kynoar are added into the N-Methyl pyrrolidone of 100ml, dispersion is equal
Active material layer slurries are obtained after even；
20g Kynoar is added into the N-Methyl pyrrolidone of 100ml, 5g vapor grown carbon is added after being uniformly dispersed
Fiber, high speed dispersion 1h (rate of dispersion is 4000 revs/min), then add the Li of 5g6BaLa2Ta2O12, high speed dispersion 1h (dispersion speed
Degree is 2000 revs/min), obtain solid electrolyte layer slurries；
20g Kynoar is added into the N-Methyl pyrrolidone of 100ml, 5g vapor grown carbon is added after being uniformly dispersed
Fiber, high speed dispersion 1h (rate of dispersion is 4000 revs/min), then the ammonium polyphosphate of 5g is added, high speed dispersion 1h (rate of dispersion
It is 2000 revs/min), obtain energy-storage function layer slurries；
2) conductive layer slurries are coated on by 10 μm of double light copper foil surfaces by intaglio press, it is dry after formation with a thickness of
3 μm of conductive layer；In conductive layer surface by coater active material layer slurry, formed after dry with a thickness of 300 μm
Active material layer；In active material layer surface by coater solid electrolyte layer slurries, formed after dry with a thickness of 10 μ
The solid electrolyte layer of m；In solid electrolyte layer surface by coater energy-storage function layer slurries, thickness is formed after dry
For 5 μm of energy-storage function layers to get.
The lithium ion battery of the present embodiment, using the negative electrode tab of the present embodiment, remaining is the same as embodiment 1.
Embodiment 4
The mobile base station of the present embodiment low temp lithium ion battery cathode pole piece, the basic phase of negative electrode tab with embodiment 1
Together, difference is only that conductive agent using carbon black, and functional materials use melamine pyrophosphate, and solid electrolyte uses
Li6MgLa2Ta2O12。
The lithium ion battery of the present embodiment, using the negative electrode tab of the present embodiment, remaining is the same as embodiment 1.
In other embodiments of the invention, the melamine pyrophosphoric of dimethyl silicone polymer alternate embodiment 4 can be used
Salt prepares corresponding cathode pole piece and lithium ion battery according to the identical method of embodiment 4.
Embodiment 5
The mobile base station of the present embodiment low temp lithium ion battery cathode pole piece, including copper foil are remote in two lateral edge of copper foil
Active material layer, solid electrolyte layer, the energy-storage function layer set gradually from copper thickness direction, active material layer, solid electricity
It is same as Example 1 to solve matter layer, the composition of energy-storage function layer, thickness.After copper foil surface prepares active material layer, then in activity
Substance layer surface coats solid electrolyte layer slurries, forms solid electrolyte layer after dry；Then in solid electrolyte layer surface
Energy-storage function layer slurries are coated, form energy-storage function layer after dry；The active material layer slurries, solid electrolyte layer slurries,
The composition of energy-storage function layer slurries and specific preparation process can refer to corresponding preparation step in embodiment 1.
Embodiment 6
7 cathode pole piece of embodiment is free of solid electrolyte layer, remaining is with embodiment 1, i.e., along the side far from afflux body thickness
To conductive layer, active material layer, energy-storage function layer is set gradually, corresponding lithium ion battery is prepared according to the method for embodiment 1.
Embodiment 7
The mobile base station of the present embodiment low temp lithium ion battery cathode pole piece, including copper foil are remote in two lateral edge of copper foil
Active material layer, the energy-storage function layer set gradually from copper thickness direction, active material layer, the composition of energy-storage function layer, thickness
It spends same as Example 1.After copper foil surface prepares active material layer, then in active material layer surface coating energy-storage function layer slurry
Liquid forms energy-storage function layer after dry；The active material layer slurries, the composition of energy-storage function layer slurries and specific preparation process
It can refer to corresponding preparation step in embodiment 1.
Comparative example 1
1 cathode pole piece of comparative example is free of energy-storage function layer, remaining is with embodiment 1, i.e., along the direction far from afflux body thickness
Conductive layer, active material layer, solid electrolyte layer are set gradually, prepares corresponding lithium ion battery according to the method for embodiment 1.
Test example 1
The imbibition liquid-keeping property of this test example detection Examples 1 to 7 comparative example 1；1) imbibition ability test method are as follows: by pole
Piece, which is placed in electrolyte, keeps 1.0min, weighs the weight m1 (g) of pole piece after Electolyte-absorptive later, and subtract placement before
Pole piece weight m2 (g), i.e. m1-m2, and it is converted into volume V (ml), the rate of liquid aspiration for finally obtaining pole piece is V/1 (ml/min)；
2) it protects liquid rate: weighing the weight m1 (g) of pole piece first, placing this pole piece weigh the weight of pole piece for 24 hours later is m2 (g), it
Calculating=m2/m1*100% afterwards must both protect liquid rate.The results are shown in Table 1.
The imbibition liquid-keeping property comparative test result of each embodiment and comparative example of table 1
| Serial number | Rate of liquid aspiration (mL/min) | It protects liquid rate (electrolyte content/0h electrolyte content for 24 hours) |
| Embodiment 1 | 6.4 | 95.3% |
| Embodiment 2 | 5.9 | 94.6% |
| Embodiment 3 | 5.8 | 94.5% |
| Embodiment 4 | 5.7 | 93.4% |
| Embodiment 5 | 5.5 | 93.1% |
| Embodiment 6 | 5.2 | 92.8% |
| Embodiment 7 | 3.4 | 83.7% |
| Comparative example 1 | 2.8 | 81.8% |
By the test result of table 1 it is found that the embodiment of the present invention 1~7 the rate of liquid aspiration of negative electrode tab, protect liquid rate and be much better than pair
Ratio, the reason is that the hole configurations of solid electrolyte layer is flourishing, lithium ion transport rate is fast, the functionality in energy-storage function layer
The characteristic that substance has partial size small, the two cooperate with the imbibition liquid-keeping property for increasing negative electrode tab.
Test example 2
This test example detects the low temperature electrochemical performance of the lithium ion battery of each embodiment and comparative example, charge and discharge when detection
Multiplying power is 0.3C/0.3C, and the results are shown in Table 2.
The cryogenic property testing result of the lithium ion battery of each embodiment and comparative example of table 2
By the test result of table 2 it is found that the cryogenic property of Examples 1 to 7 lithium ion battery is much better than comparative example, -20
DEG C capacity retention ratio reach 77.5%, -40 DEG C of capacity retention ratio reaches 45.7%, can satisfy northern outdoor moving base station
Requirement；The solid electrolyte layer of cathode pole piece of the present invention under cryogenic, can supplement offer lithium ion, energy storage function
Ergosphere has the function of the absorption heat, energy storage in charge and discharge process, can provide heat at low temperature, each layer comprehensive function
As a result the low temperature discharge ability of lithium ion battery is improved.
Claims (8)
1. a kind of mobile base station low temp lithium ion battery cathode pole piece, which is characterized in that including collector, active material
Layer further includes the energy-storage function layer of the side of the separate collector positioned at active material layer, and the energy-storage function layer includes function
Property substance and conductive agent, the mass ratio of functional materials and conductive agent is (1~5): (1~5), and the functional materials are trimerization
Cyanamide cyanurate, melamine salt of pentaerythritol phosphate, ammonium polyphosphate, dimethyl silicone polymer, melamine coke phosphorus
One of hydrochlorate；
Solid electrolyte layer is additionally provided between active material layer and energy-storage function layer, the solid electrolyte layer includes solid electrolytic
The mass ratio of matter and conductive agent, solid electrolyte and conductive agent is (1~5): (1~5)；The solid electrolyte is
Li5La3Ta2O12、Li5La3Nb2O12、Li6BaLa2Ta2O12、Li6MgLa2Ta2O12One of.
2. mobile base station as described in claim 1 low temp lithium ion battery cathode pole piece, which is characterized in that active material
Layer, solid electrolyte layer, energy-storage function layer thickness ratio be (100~300): (5~10): (1~5).
3. mobile base station as described in claim 1 low temp lithium ion battery cathode pole piece, which is characterized in that in collector
Conductive layer is equipped between active material layer.
4. mobile base station as claimed in claim 3 low temp lithium ion battery cathode pole piece, which is characterized in that conductive layer by
The mass ratio of three-dimensional carbon material and binder composition, three-dimensional carbon material and binder is (60~80): (20~40)；The three-dimensional
Carbon material is that In-situ reaction carbon nanotube, graphene obtain on carbon fiber.
5. mobile base station as claimed in claim 3 low temp lithium ion battery cathode pole piece, which is characterized in that conductive layer,
The thickness ratio of active material layer is (1~3): (100~300).
6. a kind of preparation method of mobile base station as described in claim 1 low temp lithium ion battery cathode pole piece, special
Sign is, comprising: after collection liquid surface prepares active material layer, in active material layer surface coating solid electrolyte layer slurry
Liquid forms solid electrolyte layer, then coats energy-storage function layer slurries in solid electrolyte layer surface after dry, formed after dry
Energy-storage function layer；The energy-storage function layer slurries are mixed by functional materials, conductive agent, binder, solvent.
7. preparation method as claimed in claim 6, which is characterized in that in the energy-storage function layer slurries, functional materials are led
Electric agent, binder mass ratio be (1~5): (1~5): (10~20).
8. a kind of use the mobile base station described in claim 1 lithium ion battery of low temp lithium ion battery cathode pole piece.
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| CN105118970A (en) * | 2015-10-14 | 2015-12-02 | 中航锂电（洛阳）有限公司 | Lithium ion battery composite pole piece, preparation method thereof and lithium ion battery |
| CN105958008A (en) * | 2016-06-30 | 2016-09-21 | 深圳博磊达新能源科技有限公司 | Composite positive electrode plate of lithium ion battery, preparation method thereof and lithium ion battery |
| CN106099041A (en) * | 2016-08-26 | 2016-11-09 | 深圳博磊达新能源科技有限公司 | A kind of lithium titanate composite negative pole pole piece and lithium titanate battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105118970A (en) * | 2015-10-14 | 2015-12-02 | 中航锂电（洛阳）有限公司 | Lithium ion battery composite pole piece, preparation method thereof and lithium ion battery |
| CN105958008A (en) * | 2016-06-30 | 2016-09-21 | 深圳博磊达新能源科技有限公司 | Composite positive electrode plate of lithium ion battery, preparation method thereof and lithium ion battery |
| CN106099041A (en) * | 2016-08-26 | 2016-11-09 | 深圳博磊达新能源科技有限公司 | A kind of lithium titanate composite negative pole pole piece and lithium titanate battery |
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